Mk. AGROEKOLOGI
PERTANIAN
BERKELANJUTAN
Oleh:
Prof Dr Ir Soemarno, M.S.
Jur tanah FP UB Oktober 2011
1
MAKNA SAINTIFIK “PERTANIAN”
PERTANIAN
Biologi- Tanaman
Teknologi :
Bertanam
Memelihara
Sarana produksi:
Tanah/lahan
Benih / bibit
Air
Pupuk/Rabuk
Pestisida/ Obat
Tenaga Kerja
BUDIDAYA
TANAMAN
MANAJEMEN
USAHATANI
PANEN &
PASCAPANEN
Penanganan Hasil ;
Pengolahan; Pemasaran
TROPIKA
IKLIM
AIR
TANAH
JASAD
DINAMIKA &
RAGAM
KEBERLANJUTAN
2
PERMASALAHAN SERIUS dalam Pertanian
Semakin
meningkatnya biaya
dan ketergantungan
thd input eksternal
(bahan kimia dan
energi)
Semakin
meningkatnya
pencemaran air
akibat pupuk dan
pestisida
Semakin menurunnya
produktivitas tanah
akibat erosi tanah dan
kehilangan (pencucian)
hara dari tanah
Semakin meningkatnya
ancaman residu bahan
agrokimia thd kualitas
dan keamanan pangan
3
PERTANIAN BERKELANJUTAN itu Apa?
The word "sustain," from the Latin sustinere
(sus-, from below and tenere, to hold), to
keep in existence or maintain, implies longterm support or permanence.
4
PERTANIAN BERKELANJUTAN = SUSTAINABLE
AGRICULTURE
“Pertanian yg dapat berkembang secara tidak terbatas ke arah manfaat yg
semakin besar bagi manusia, penggunaan sumberdaya yg lebih efisien, dan
berkesetimbangan dg kondisi lingkungan yang sesuai untuk manusia dan
spesies lainnya”.
Manfaat
bagi
manusia
Lingkungan yg
sesuai bagi
manu-sia &
spesies lain
Penggunaan
sumberdaya
yg efisien
5
TIGA ELEMEN PENTING
PERTANIAN BERKELANJUTAN
Income
Generation
(menghasilkan
pendapatan)
Natural
Resource
Conservation
(Konservasi
Sumberdaya
Alam)
Food availability
and consumption
(Pangan dan
bahan konsumsi
lain)
6
Sustainable
agriculture
integrates
three main
goals:
environmental
stewardship,
farm
profitability,
and
prosperous
farming
communities.
7
KONSEP “LOW INPUT”
PERTANIAN BERKELANJUTAN
ECOLOGICAL
FARMING
BIOLOGICAL
FARMING
BIODYNAMIC
FARMING
NATURAL
FARMING
AGROECOLOGICAL
FARMING
ORGANIC
FARMING
REGENERATIVE
FARMING
LOW RESOURCES
FARMING
ECO-AGRICULTURE
ECO-FARMING
ALTERNATIVE
FARMING
8
PRASYARAT BAGI
PERTANIAN BERKELANJUTAN
1. Kualitas tanah tidak boleh rusak,
topsoil tidak boleh menipis
2. Sumberdaya air tersedia harus mampu memenuhi
kebutuhan tanaman, tdk berlebihan & tdk kekurangan
3. Integritas biologis dan ekologis harus dilestarikan melalui
berbagai upaya pengelolaan sumberdaya genetik, siklus
hara, hama tanaman, dll
4. Sistem harus menguntungkan secara ekonomis
5. Ekspektasi sosial dan norma budaya harus
kebutuhan sandang dan pangan masyarakat
dipenuhi, spt
9
PERTANIAN BERKELANJUTAN
Sustainable agriculture integrates three main goals: environmental
stewardship, farm profitability, and prosperous farming communities.
These goals have been defined by a variety of disciplines and may be looked at
from the vantage point of the farmer or the consumer.
DESKRIPSI
Sustainable agriculture refers to the ability of a farm to produce food
indefinitely, without causing severe or irreversible damage to ecosystem
health.
Two key issues are biophysical (the long-term effects of various practices on
soil properties and processes essential for crop productivity) and socioeconomic (the long-term ability of farmers to obtain inputs and manage
resources such as labor).
10
PERTANIAN BERKELANJUTAN
As it pertains to
agriculture, sustainable
describes farming
systems that are
"capable of maintaining
their productivity and
usefulness to society
indefinitely.
Such systems... must be
resource-conserving,
socially supportive,
commercially
competitive, and
environmentally
sound."
11
CIRI PENTING
PERTANIAN BERKELANJUTAN
CROP
ROTATION
Field crop Legume Forage crop
NUTRIENT
MANAGEMENT
Prod.
TERNAK:
Pakan hijauan
Rabuk
kandang
Pest Control:
Biological control
Pesticide treatment
Pupuk - Rabuk
Kandang/Kompos Rabuk Hijau
Weed Control
Olah tanah
Selective
Herbicides
12
PELUANG BESAR untuk
PERTANIAN BERKELANJUTAN
Internal Soil
External Hydrophonic Medium
Sun: Radiasi
Sumber utama energi
Energi ini sbg katalis untuk
konversi energi fosil
Water
Utamanya hujan dan
ditunjang air irigasi
Sistem distribusi air terpusat,
Bendungan-waduk-jaringan
Nitrogen
Dihimpun dari udara
dan di-daur ulang
Terutama dari pupuk sintetik
(pupuk buatan)
Mineral
dilepaskan dari cadangan
tanah dan di daur-ulang
Weed & pest
control
Biologis & Mekanis
Ditambang, diolah, diimpor
Dengan pestisida
13
PELUANG BESAR untuk
PERTANIAN BERKELANJUTAN
Internal Soil
Eksternal Hydrophonic Medium
ENERGY
Sebagian dihasilkan
on-farm
Tergantung bahan bakar
fosil
SEED
Sebagian dihasilkan
on-farm
Semuanya/seluruhnya dibeli
Management
decisions
Oleh petani & masyarakatnya
Sebagian dilakukan oleh
produsen SAPROTAN
ANIMALS
CROPPINGSYSTEM
Dihasilkan secara sinergis on-farm
Rotasi dan diversitas
sangat diutamakan
Produksi pakan di tempat
lain yg terpisah
Monocropping
14
PELUANG BESAR untuk
PERTANIAN BERKELANJUTAN
Internal Soil
External Hydrophonic Medium
VARIETAS
Tahan thd keterbatasan
air dan kesuburan tanah
Memerlukan input yang
banyak
LABOR
Sebagian besar kerja
dilakukan rumahtangga
Sebagian besar pekerjaan
dilakukan tenaga upahan
bertempat-tinggal on-farm
CAPITAL
Sumber awal rumahtangga & masyarakat;
peningkatan kesejahteraan
diinvestasikan secara lokal
Sumber awal adalah kredit
dan keuntungan terutama
mengalir ke luar dari farm
…………...
15
KOMPONEN-KOMPONEN
SISTEM PERTANIAN BERKELANJUTAN
Pengelolaan
Kesuburan
Tanah
Integrated
Pest
Management
Pergiliran
Tanaman
Bioteknologi
&
Crop Breeding
Conservation
Tillage
Innovative
Cropping
Systems
Weeds
Management
Animals Roles
Feedcrop
Management
16
Sustainable agriculture refers to
the ability of a farm to produce
food indefinitely, without causing
severe or irreversible damage to
ecosystem health.
17
Productivity and usefulness to society indefinitely
18
PERTANIAN BERKELANJUTAN
• Sustainable agriculture is one that produces abundant food
without depleting the earth’s resources or polluting its
environment.
• It is agriculture that follows the principles of nature to
develop systems for raising crops and livestock that are,
like nature, self-sustaining.
• Sustainable agriculture is also the agriculture of social
values, one whose success is indistinguishable from vibrant
rural communities, rich lives for families on the farms, and
wholesome food for everyone.
• But in the first decade of the 21st Century, sustainable
agriculture, as a set of commonly accepted practices or a
model farm economy, is still in its infancy.
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PRODUKSI
TANAMAN
RABUK
KANDANG
TANAMAN PAKAN
DALAM ROTASI
PRODUKSI
TERNAK
RESIDU /
LIMBAH
TANAMAN
20
PERTANIAN BERKELANJUTAN
Farming sustainably means growing crops and
livestock in ways that meet three objectives
simultaneously:
– Economic profit
– Social benefits to the farm family and the community
– Environmental conservation
• Sustainability can be observed and measured;
indicators that a farm or rural community is
achieving the three objectives of sustainability
include: economic, social, environment
21
PERTANIAN BERKELANJUTAN
• Economic Sustainability
– The family savings or net worth is consistently
going up.
– The family debt is consistently going down.
– The farm enterprises are consistently profitable
from year to year.
– Purchase of off-farm feed and fertilizer is
decreasing.
– Reliance on government payments is
decreasing.
22
The farm enterprises are profitable from
year to year:
Tumpangsari Pepaya dg padi gogo.
23
PERTANIAN BERKELANJUTAN
• Social Sustainability
– The farm supports other businesses and
families in the community.
– Money circulate within the local economy.
– The number of rural families is going up or
holding steady.
– Young people take over their parents'
farms and continue farming.
– College graduates return to the community
after graduation.
24
PERTANIAN BERKELANJUTAN
• Environmental Sustainability
– There is no bare ground.
– Clean water flows in the farm's ditches and
streams.
– Wildlife is abundant.
– Fish are prolific in streams that flow
through the farm.
– The farm landscape is diverse in
vegetation.
25
The farm landscape is diverse in
vegetation
26
PERTANIAN BERKELANJUTAN
1.These three objectives are managed more as a single
unit, even though we must discuss them separately.
2.The three objectives overlap constantly. For example,
economic decisions affect the local community—buying
from out of state instead of from a local supplier.
3.Environmental decisions affect the economics—allowing
soil erosion increases the need for irrigation and more
fertilizer.
27
Economic Sustainability
• Selecting Profitable Enterprises to Ensure
Economic Sustainability
– Economic sustainability increasingly depends on
selecting profitable enterprises, sound financial
planning, proactive marketing, risk management, and
good overall management.
– The key for row-crop producers may be to explore
income opportunities other than traditional
commodity crops, such as contract growing of seeds
for vegetable, rice and specialty crops.
28
These specialty
crops are not for
everyone;
only a certain
number of
hectares of land
can be grown
because of
limited markets.
29
Economic Sustainability
Selecting Profitable Enterprises to Ensure Economic
Sustainability
– Expanding organic markets suggest another possible
niche. "Alternative" crops like herbs, mushrooms or
guava may be an option.
– When we try to produce a single product such as corn, or
groundnuts our risk is high because "all our eggs are in
one basket."
– When we integrate plant and animal agriculture we
distribute overhead and risk among several enterprises.
30
When we
integrate
plant and
animal
agriculture
we distribute
overhead
and risk
among
several
enterprises.
31
Economic Sustainability
Perencanaan keuangan yang komprehensif haruslah:
The holistic financial planning process provides a monthly
roadmap to help people navigate through their financial year,
assured that the profit will be there at year's end.
The income is planned first, then a planned profit is allocated as
the first expense item.
The remaining expense money is allocated sequentially where it
will do the most good.
32
Economic Sustainability
Perencanaan keuangan yang komprehensif
haruslah:
This sequential allocation requires that the farmer spend no
more than necessary to run the enterprise for a year, while
preserving the planned profit.
This potent financial planning process empowers people to make
decisions that are simultaneously good for the environment, the
local community, and the bottom line.
Also evaluate other financial planning tools that allow enterprise
budgeting, cost calculations, partial budgeting analysis, and
these can be available from normal softwares available in the
market.
33
PERTANIAN BERKELANJUTAN
• Setiap usahatani memerlukan perencanaan pemasaran
yang jelas.
• Marketing can take many forms, ranging from passive marketing to
the commodity chain all the way up to marketing a retail product
directly to consumers.
• Which marketing method you choose will have a profound effect on
the price your product commands.
• Doing some market research is essential in order to understand
your market, competition, and consumer trends, and to project
potential sales volume and prices.
• Specialty and direct markets such as organic, GMO-free, and other
"green" markets yield more income but require more marketing by
the producer.
• Pemasaran langsung tidak berlaku untuk setiap
orang .
34
Social Sustainability
Pengambilan keputusan
usahatani berdampak
langsung pada
masyarakat sekitarnya .
Misalnya, the decision to
expand your operation
requires the acquisition of
your neighbor's farm.
To have your neighbor's farm,
you must make the decision
that your neighbor's farm is
more important to you than
your neighbor.
35
Social Sustainability
Keputusan sosial termasuk:
1. buying supplies locally
rather than ordering from out
of state,
2. figuring out ways to connect
local consumers with your
farm,
3. taking a consumer-oriented
approach to production and
management practices where
both the farmer and
consumer wins,
4. finding opportunities to
ensure that neighboring
communities can learn about
sustainable food production.
36
PERTANIAN BERKELANJUTAN
• Marketing strategies such as community supported agriculture
(CSA), direct marketing through farmers markets or road side
stalls all have a positive impact on the local community.
• When people have a choice between supporting local producers or
paying a little less for the products of the industrial food system,
they will often choose to support their neighbors.
• Farmers selling locally benefit from differentiating their products
and services by qualities other than price.
• Fresh produce, specialty items, and locally grown and processed
foods are competitive in the market place, especially when
consumer education and personal contact with the farmer are part
of the marketing plan.
37
Marketing strategies , direct marketing through
farmers markets or road side stalls all have a
positive impact on the local community.
38
PERTANIAN BERKELANJUTAN
Social sustainability also
includes the quality of life of
those who work and live on the
farm, including good
communication, trust, and
mutual support.
Full family participation in farm
planning is an indication that
the quality of life is high.
Talking openly and honestly,
spending time together, a
feeling of progress toward
goals, and general happiness.
Quality of life will be defined
somewhat differently by each
individual and family, based on
their values and goals
39
PERTANIAN BERKELANJUTAN
Perencanaan & Pengambilan Keputusan
– Managing for three objectives simultaneously (economics, society,
environment) depends on clear goal-setting and effective decisionmaking.
– Several good tools for decision-making, goal-setting, and wholefarm management are available to farmers.
– It is useful to assume that if your plan will not work, then develop a
system for determining (as soon as possible) if it isn't working.
– For example, if the goal includes increased biodiversity, the farmer
needs to know—quickly—if the grazing or cropping system being
used is actually increasing the number of plant species in the area
of concern.
– Monitoring is particularly important in sustainable agriculture,
which relies on natural systems to replace some of the work done
by input products like fertilizer and pesticides.
40
PERTANIAN BERKELANJUTAN
Kemampuan mengevaluasi
dan merencanakan-kembali
sangat penting bagi petani
guna keberlanjutan
ushataninya
When part of the plan is not
working as intended, it
becomes necessary to replan.
The concept of planningmonitoring-controllingreplanning is a key
characteristic of HolisticManagement and is referred
to as the feedback loop.
41
PERTANIAN BERKELANJUTAN
• The transition toward more sustainable
farming requires not only planning and
decision-making skills, but access to
appropriate and helpful information.
• Fortunately, increased interest in sustainable
agriculture has stimulated greater
investment in research and education.
• As a result, much more usable information is
available today than ever before, accessible
through various means
42
Environmental Sustainability
• Sustainable agriculture can be viewed as
ecosystem management of complex
interactions among soil, water, plants,
animals, climate, and people.
• The goal is to integrate all these factors into
a production system that is appropriate for
the environment, the people, and the
economic conditions where the farm is
located.
43
PUPUK
Organik
Anorganik
TANAMAN
ROTASI
Gulma
Hama
PESTISIDA
KULTIVASI
Penyakit
44
PERTANIAN BERKELANJUTAN
Farms become and stay environmentally sustainable by
imitating natural systems—creating a farm landscape that
mimics as closely as possible the complexity of healthy
ecosystems.
The wastes of industrial agriculture (non-point-source
pollution) include suspended soil, nitrates, and phosphates
in stream water, and nitrates and pesticides in ground
water.
45
PERTANIAN BERKELANJUTAN
Nature tends to function in cycles, so that waste from one process
or system becomes input for another.
Industrial agriculture, in contrast, tends to function in a linear
fashion similar to a factory: inputs go in one end, and products
and waste come out the other.
It is a premise of sustainable agriculture that a
farm is a nature-based system, not a factory.
46
1. A low dependence on external / purchased inputs
2. Menggunakan sumberdaya lokal yang “renewable”
3. Dampak lingkungan yang menguntungkan :
on - farm & off - farm
4. Adapted to the existing local conditions
5. Long-term maintenance of productive capacity
6. Biological & cultural diversity
7. Knowledge of local inhabitants
8. Mencukupi kebutuhan barang domestik dan barang dapat
diekspor.
47
SISTEM PERTANIAN  SISTEM ALAMIAH
- Panen tanaman
- Teknologi Pengelolaan
- Pemupukan / perabukan
- Pengolahan tanah
- Pengairan
- Aplikasi agrokimia
- Agroteknologi lainnya.
48
PERTANIAN BERKELANJUTAN
• The simpler we try to make agriculture, the more
vulnerable we become to natural disasters and
marketplace changes.
• When we try to produce a single product such as
wheat, corn, or soybeans we are taking on huge risk.
• If instead we diversify crops and integrate plant and
animal agriculture, overhead will be spread over
several enterprises, reducing risk and increasing
profit.
• Table 1 offers some comparisons between two
models of agriculture—farming as an industrial
factory and farming as a biological system.
49
When we try to produce a single
product such as rice, corn, or
soybeans we are taking on huge
risk.
50
Table 1. Comparison of the industrial and biological models of
agriculture.
Industrial model
Biological model
Energy intensive
Information intensive
Linear process
Cyclical process
Farm as factory
Farm as ecosystem
Enterprise separation
Enterprise integration
Single enterprise
Many enterprises
Monoculture
Diversity of plants and animals
Low-value products
Higher value products
Single-use equipment
Multiple-use equipment
Passive marketing
Active marketing
51
Farm as Ecosystem: AGROEKOSISTEM
On any farm, four major ecosystem processes are at work
that, if functioning properly, will conserve the soil and
water resources and eventually reduce the overall
operating costs.
Proses alamiah ini: flow, water and mineral cycles, and
ecosystem dynamics— dapat diamati dan dapat dikelola.
52
53
Farm as Ecosystem: AGROEKOSISTEM
Energy flow is the non-cyclical path of solar energy (sunlight) into
and through any biological system.
The natural world runs on sunlight. Our management decisions
affect how much of it is captured and put to good use on the farm.
(Savory and Butterfield, 1999)
Energy flow begins when sunlight is converted into plant growth,
and continues when animals consume plants, when predator
animals consume prey, and when microorganisms decompose dead
plants and animals.
54
Farm as Ecosystem: AGROEKOSISTEM
Some energy is lost as heat at every transfer point in the food chain.
On the farm, energy capture is enhanced by maximizing—both in
space and in time—the leaf area available for photosynthesis, and
by efficiently cycling the stored solar energy through the food
chain.
Off-season cover crops, perennial vegetation, and intercropping are
among the tools for capturing more solar energy.
Menangkap energi-matahari dan mengubahnya menjadi
produk-ekonomi merupakan sumber orisinal bagi semua
kesejahteraan
55
SIKLUS AIR
56
Farm as Ecosystem: AGROEKOSISTEM
• Siklus air yang efektif dicirikan oleh tidak-adanya
erosi tanah , air cepat memasuki tanah , dan
kapasitas tanah menyimpan air cukup besar .
• The water cycle is improved by management
decisions that add to or maintain the groundcover
percentage and soil organic matter levels—the goal
is to get as much water as possible into the soil
during each rainfall.
57
Farm as Ecosystem: AGROEKOSISTEM
A surface mulch layer speeds water intake while reducing
evaporation and protecting the soil from erosion.
Minimizing or eliminating tillage, growing high-residue
crops and cover crops, and adding compost or manure to
the soil maintains groundcover and builds organic matter.
Streams flow year-round from the slow release of water
stored in the soil.
58
Minimizing or eliminating tillage, growing cover
crops, and adding compost or manure to the soil
maintains groundcover and builds organic matter.
59
Farm as Ecosystem: AGROEKOSISTEM
Such an improvement in a soil's water-holding capacity will
have a beneficial effect on crop growth, especially during
droughty periods.
The results of an effective water cycle are low
surface runoff, low soil surface evaporation, low
drought incidence, low flood incidence, high
transpiration by plants, and high seepage of water
to underground reservoirs.
60
Farm as Ecosystem: AGROEKOSISTEM
Pengelolaan bahan
organik tanah sangat
penting dalam usahatani
sayuran semusim.
One study (Hudson, 1994),
showed that raising the
percentage of organic matter
from 1% to 2% in sandy soil
increased the available water
content of that soil by 60%
(from 5% of total soil volume
to 8%).
61
Pengelolaan bahan organik tanah sangat
penting dalam budidaya tanaman tebu.
62
DEKOMPOSISI RESIDU TANAMAN YG MISKIN N
Nisbah C/N
60
Imobilisasi neto
20
Jumlah
0
NO3-
4 - 8 minggu
Mineralisasi
neto
NO3- yg baru
Evolusi CO2
CO2
Waktu
63
SIKLUS MINERAL
64
TANAMAN
PANEN
ATMOSFER
RESIDU
TANAH
PUPUK
KEHILANGAN
65
N2, N2O
NH3
Pupuk N
RABUK
UREA
LIAT
NH4+
BOT
NO3-
Jasad renik
Pencucian
66
Farm as Ecosystem: AGROEKOSISTEM
A well-functioning mineral cycle—the movement of
nutrients from the soil through the crops and animals and
back to the soil—means less need for fertilizer and feed
from off the farm.
Dalam ekosistem alamiah, unsur hara yang diperlukan
oleh tanaman selalu ber-siklus secara kontinyu dengan
sedikit sekali limbah yang terbuang dan tidak
memerlukan tambahan pupuk.
Ultimately, to be sustainable, we need to find ways to use
the natural mineral cycle to minimize our off-farm
purchase of minerals.
67
Farm as Ecosystem: AGROEKOSISTEM
Conditions and practices that inhibit the natural mineral
cycle—erosion, nutrient leaching, organic matter
depletion, selling hay or grain off the farm—tend to
reduce the farm's sustainability.
Practices that enhance the mineral cycle include on-farm
feeding of livestock, careful management of manure and
crop residues, use of catch crops to reduce nutrient
leaching losses, and practices that prevent erosion.
68
SUSTAINABLE AGRIC. SYSTEM:
SOIL EROSION & LAND DEGRADATION
1. Tanpa olah tanah atau olah tanah minimum
2. Life mulching --- legume civer crops
3. Alley cropping & agroforestry
4. Supplying mulch: Erosi dan BOT
5. Fiksasi N2 dan daur ulang hara
6. Minimizing fallowing
7. Integrasi tanaman pangan , pepohonan, rerumputan dan
ternak
8. ………….
69
Farm as Ecosystem: AGROEKOSISTEM
• An effective ecosystem dynamic is indicated by high
diversity of plants and animals both above and below
ground.
• "Diversity" bukan hanya banyaknya spesies , tetapi juga
ragam genetik dalam suatu spesies , dan struktur umur
dalam setiap populasi .
• Greater diversity produces greater stability within the
system and minimizes pest problems.
• Our choices of practices and tools directly affect the
level of biodiversity we have on the farm ( Table 2).
70
POLA TANAM DAN BIODIVERSITAS
PERTANIAN
Table 2. Listing of tools by their effect on biodiversity
Increased
Biodiversity
Intercropping
Decreased
Biodiversity
Monocropping Tillage
Crop rotation
Cover crops
Multispecies
grazing
Herbicides
Insecticides
71
PERGILIRAN TANAMAN dalam
PERTANIAN BERKELANJUTAN
PADI - PADI - KEDELAI
PADI - KEDELAI - JAGUNG
JAGUNG / KEDELAI - UBIKAYU
Manfaat
Biologis
Manfaat
Ekonomi
Manfaat
Lingkungan
BIOLOGICAL STRUCTURING
72
Farm as Ecosystem: AGROEKOSISTEM
The first step toward increasing biodiversity on the farm is
crop rotation, which helps break weed and pest life cycles
and provides complementary fertilization among the crops
in the planting sequence.
Advancing from rotation to strip intercrops brings a
higher level of biodiversity and increases sunlight capture.
Misalnya tumpangsari JAGUNG dan KEDELAI ;
PISANG dan NANAS; TEBU dan RUMPUT GAJAH .
73
Advancing from rotation to strip intercrops brings
a higher level of biodiversity and increases sunlight
capture.
For example, Strip intercropping of sugarcane and
elephant-grasses.
74
Farm as Ecosystem: AGROEKOSISTEM
Borders, windbreaks, and
special plantings for natural
enemies of pests provide
habitat for beneficial
organisms, further
increasing biodiversity and
stability.
The addition of appropriate
perennial crops, shrubs, and
trees to the landscape
enhances ecosystem
dynamics still further.
75
The addition of
appropriate
perennial crops,
and trees to the
landscape
enhances
ecosystem
dynamics still
further.
76
Farm as Ecosystem: AGROEKOSISTEM
• These four ecosystem processes (energy flow, water cycle,
mineral cycle, and ecosystem dynamics) function together
as a whole, each one complementing the others.
• When we modify any one of these, we affect the others as
well.
• When we build our farm enterprises around these
processes, we are applying nature's principles to sustain
the farm for our family and for future generations.
• When we fight nature's processes, we incur extra costs
and create more problems, hurting ourselves and the
ecosystem on which we depend.
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PENERAPAN PRINSIP EKOSISTEM
When beginning the
transition, the big
question is how to
apply the principles of
economic profitability,
social enhancement,
and ecological
improvement ….
in the field,
in the community,
in the financial
process.
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PENERAPAN PRINSIP EKOSISTEM
The ultimate goal is to farm in such a way that we extract
our living as the interest, while preserving the social, water,
and soil capital.
We want to ensure that our activities do not compromise
the landscape and community resources over the long
term.
Now let's look at some management concepts aimed at
fostering the four ecosystem processes discussed earlier.
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PENERAPAN PRINSIP EKOSISTEM
Menjaga permukaan tanah selalu tertutup vegetasi
sepanjang tahun
Under natural conditions the soil remains covered with a
skin of dead plant material, which prevents and moderates
temperature extremes, increases water penetration and
storage, and enhances soil aeration.
Most importantly, the soil skin maintains soil structure and
prevents erosion by softening the impact of falling
raindrops.
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Under conditions
the soil remains
covered with a skin
of dead plant
material, which
prevents and
moderates
temperature
extremes,
increases water
penetration and
storage, and
enhances soil
aeration.
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PENERAPAN PRINSIP EKOSISTEM
Menjaga permukaan tanah selalu tertutup vegetasi
sepanjang tahun
Bare ground, on the other hand, is vulnerable to water and
wind erosion, dries out more quickly, and loses organic
matter rapidly.
The major productivity costs to the farm associated with
soil erosion come from the replacement of lost nutrients
and reduced water holding ability, accounting for 50 to
75% of productivity loss. (Pimentel et al., 1995)
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PENERAPAN PRINSIP EKOSISTEM
Menjaga permukaan tanah selalu tertutup vegetasi
sepanjang tahun
Material tanah yang terangkut oleh EROSI mengandung tiga
kali lebih banyak unsur hara dibandingkan dnegan material
tanah yang tertinggal, dan sekitar 1.5 - 5 kali lebih kaya
bahan organik . (Pimentel et al., 1995)
This organic matter loss not only results in reduced water
holding capacity and degraded soil aggregation, but also
loss of plant nutrients, which must then be replaced with
fertilizers.
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PENERAPAN PRINSIP EKOSISTEM
Menjaga permukaan tanah selalu tertutup
vegetasi sepanjang tahun
The table below shows the effect of slight, moderate,
and severe erosion on organic matter, soil
phosphorus level, and plant-available water on a silt
loam soil in Indiana.
(Schertz et al., 1984)
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Table 3. Effect of erosion on organic matter, phosphorus, and
plant-available water.
Organic
matter
Phophorus
Plant-available
water
%
Kg/ha
%
Slight
3.0
69.50
7.4
Moderate
2.5
68.38
6.2
Severe
1.9
44.84
3.6
Erosion level
Source: Schertz et al., 1984.
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